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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제7호
- 발행연도
- 2009.1
- 수록면
- 1,024 - 1,031 (8page)
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초록· 키워드
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A near-IR chemiluminescence spectrometer designed to study chemical sources of singlet oxygen ($^1O_2$, $^1{\Delta}_g$), was built by coupling a reactor compartment to a nitrogen-cooled Ge diode through a bundle of optical fibres. This device was used to optimise the generation of $^1O_2$ from the hydrogen peroxide.lanthanum(III) catalytic system. The reaction kinetics were studied with a $2^33^3$//12 screening experimental design comprising twelve experiments. The influence of six factors was examined: the nature of the lanthanum salt (hydroxide, oxide or nitrate) and its concentration (0.05 or 0.1 mol $L^{-1}$), the pH value (5, 7 or 9), the concentration of $H_2O_2$ (0.5, 1 or 2 mol $L^{-1}$), the temperature (20 or $30^{\circ}C$) and the concentration of EDTA (0 or 5 mmol $L^{-1}$). Two responses were measured: the rate of $H_2O_2$ disproportionation and the intensity of the luminescence of $^1O_2$ at 1270 nm. The essential factor is the nature of the lanthanum salt since $La(NO_3)_3$ induces the disproportionation of $H_2O_2$ about $60{\tims}$ faster than $La_2O_3$ or $La(OH)_3$. Other influencing factors are the pH value, the concentration of $H_2O_2$, the temperature and the concentration of the lanthanum salt whereas the concentration of EDTA has no effect on the reaction. The catalytic activity of $La(NO_3)_3$ was then investigated in further detail by studying the influence of two factors (pH and $[H_2O_2]$) thanks to a Doehlert design.
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